Fuel burner



E. BOLAND" FUEL BURNER Filed Nov. 8, 1927 -March 19, 1935.

2 Sheets-Sheet 1 INVENTOR n/uaC ATTORNEYS March 19, 19.35.

E. 1.. BOLAND FUEL BURNER- Filed Nov. 8, 1927 2 Sheets-Sheet 2 ATTOAA/E Y5.

Waiented Mar. 1%, 1935 PATENT OFFICE.

FUEL BURNER Edward L. Boland, Bayonne,

N. J., assignor, by

mesne assignments, to Fuller Lehigh Company, a corporation of Delaware Application November 8, 1927, Serial No. 231,813

10 Claims.

This invention relates to a deviceby which oil and finely divided fuel, such as pulverized "coal, for example, can be burned either singly or simultaneously. The invention will be understood 5 from the description in connection with the accompanying drawings in which Fig. 1 is a longitudinal section through an illustrative embodiment of the invention taken along the line l-1 of Fig. 2; Fig. 2 is a front view of the device; Fig.

l 3 is a section along the line 3-3 of Fig. 1; Fig. 4

is a view partly in section showing a modification of one of the elements, and Fig. is a sectional view illustrating certain parts in Fig. 1.

In the drawings reference character 1 indicates an inlet that is in the form of a truncated cone and may be mounted in an opening in a furnace wall. The inlet 1 is provided along the inside surface thereof with inwardly extending blades or vanes 2 that are set, at an angle to the axis of the cone so that a whirling motion will be given to the incoming air as it passes into the furnace.

An air register 3 of cylindrical shape surrounds the space in front of the inlet 1 and is provided with spaced longitudinal openings around its periphery. A series of pivoted doors or dampers 4 preferably of thin metal serve to open or close the openings around the periphery of the air register.

An operating mechanism 5 is connected to the dampers 4 to move them into and out of their closing positions. The air register and dampers and operating mechanism are well known in this art, and it is unnecessary to describe the same more in detail.

The front end plate vided with a central cylindrical support '7 pulverized the support '1 and 6 of the air register is proopening in which opening va is mounted. A conduit 8 for coal and primary air extends through is fixed in position therein by means of the set screw 9. The conduit 8 is provided with a telescoping section 10 so that the outlet end of the pulverized fuel conduit can be adjusted in position with respect to the furnace. A

snail-shaped housing the pulverized fuel and primary air from a blower or other source and introduce them into the conduit 8.

A longitudinally movable pipe 12 extends through a stufilng box 13 in the housing 11 and is centered by pins peller plate or deflector 14 is mounted on the pipe 12 at the inner end thereof. The impeller plate 14 is conically shaped, and is provided with struck-in radial blades 15 disposed at an angle to the main surface of the impeller. A handle 16 atthc outside of the housinl 11 isattached to the 11 may be provided to lead 12, attached thereto. An impipe 12 nally.

An oil burner pipe of a well known type carrying an atomizer 121 at its forward end may extend through the pipe 12 and be used for burning oil when desired. A pivoted yoke 17 may be used for retaining the oil pipe in position. Ibis yoke is adjustable along the rod 18.

In the modification shown in Fig. 4, the snailshaped housing 11 is dispensed with and a curved in connection 20 connects the conduit 3 to the source of pulverized fuel and primary air.

The operation is as follows: when the burner is used for burning oil alone, the oil is introduced through the oil burner pipe that extends through 15 the pipe 12 and is sprayed into the-furnace in the usual manner. The section 10 of the pulverized fuel and primary air conduit is set at the proper position and oil is introduced through the, oil pipe while air for combustion enters between an the vanes 2. The air enters through the air register 3 and inlet 1, and is given a whirling motion by means of the vanes 2, as well as the impeller 14 When pulverized fuel alone is burned, it is introduced with the primary air through the con- 35 duit 8 in the usual way and the primary air and pulverized fuel striking the impeller 14 are thoroughly mixed with the secondary air that enters through the inlet 1. While the pulverized fuel is being burned, the section 10 of the pulverized 30 fuel conduit and the pipe 12 carrying the impeller 14 are adjusted longitudinally so as to obtain the best results. Both oil and pulverized fuel can be burned simultaneously by means of this device, and either one can be ignited by the other when 35 burning either and changing over to the other. The impeller plate 14 is in the path of the stream of pulverized fuel and primary air that enters through the conduit 8 and spreads the same on all sides while permitting some to pass through 40 so that rapid combustion of the fuel is promoted.

I claim:

1. In a fuel burnier, an inlet into a furnace, a pulverized fuel conduit extending into said inlet. an oil burner extending through said conduit, .45 said conduit and oil burner being adjustable. longitudinally, a deflector mounted in the path of the fuel from said conduit, and means for introducing air into said furnace around said fuel conduit and for giving it a whirling motion.

2. In a fuel burner, an inlet into a furnace, a cylindrical pulverized fuel conduit extending into said inlet, means for passing secondary air into said inlet around said fuel conduit, an oil burner pipe extending through said conduit. and an imand serves to move the same longitudipeller surrounding said oil burner pipe and comprising a circular series of deflecting blades having fuel and air passages therebetween and arranged in a conical formation and .against which the pulverized fuel is directed, said impeller being arranged to throw a portion of the pulverized fuel into the path of the secondary air passing through said inlet, and said impeller being mounted behind the discharge end of said oil burner pipe whereby oil does not come in contact therewith.

3. 'In a fuel burner, an inlet into a furnace, a cylindrical pulverized fuel conduit extending into said inlet, means for passing secondary air into said inlet around said fuel conduit, an oil burner pipe extending through said conduit, and an impeller surrounding said oil burner pipe and comprising a circular series of deflecting blades having fuel and air pasages therebetween and arranged in a conical formation and against which the pulverized fuel is directed, in combination with vanes in said inlet adapted to give said secondary air a whirling motion, said impeller being arranged to throw a portion of the pulverized fuel into the path of the secondary air passing through said inlet, and said impeller being mounted behind the discharge end of said oil burner pipe whereby oil does not come in contact therewith.

4. In a fuel burner, a conduit for finely-divided fuel, an oil pipe extending through said conduit with its discharge end beyond the discharge end thereof, and a flaring impeller comprising-a circular series of deflecting blades having fuel and air passages therebetween and arranged in a conical formation, said impeller being positioned forwardly of, the discharge end of said conduit in the path of the fuel discharge therefrom and adjacent to and out of the path of the discharge from said oil pipe.

5. In a burner for finely divided fuel and oil, an air chamber, a conduit for the finely divided fuel extending substantially through said air chamber, an oil pipe extending through said conduit with its discharge end beyond the discharge end of said conduit, and a flaring impeller comprising a circular series of deflecting blades having fuel and air passages therebetween and arranged in a conical formation, said impeller being positioned forwardly of the discharge end of said conduit in the path of the fuel discharge therefrom and adjacent to and out of the path of the discharge from said oil pipe and serving to mix the finely divided fuel with the air from the air chamber and to give a whirling action to air prior to contacting with-the oil issuing from said oil pipe.

6. A combination pulverized fuel and oil burner comprising means forming an air chamber having a circular series of air whirling blades adjacent its discharge end, a pulverized fuel discharge nozzle extending into said air chamber and having its forward end extending axially of and terminating adjacent to said series of air whirling blades, an oil spray nozzle extending axially of and within said pulverized fuel nozzle and termin ting beyond the forward end thereof, and a forwardly flaring conically-shaped impeller plate adjustably spaced from said pulverized fuel nozzle and symmetrically arranged relative to the forward ends of said pulverized fuel and oil spray nozzles, openings in said impeller plate for the passage of pulverized fuel from said pulverized fuel nozzle, and a series of deflecting blades on the forward face of said impeller plate arranged to deflect pulverized fuel passing through said impeller plate openings, said impeller plate andv ing a circular series of air whirling blades adjacent its discharge end, a pulverized fuel discharge nozzle extending into said air chamber and-having its forward end extending within and terminating adjacent to said series of air whirling blades, an oil spray nozzle extending axially of and within said pulverized fuel nozzle and terminating beyond the forward end thereof,'and a forwardly flaring conically-shaped impeller plate spaced from said pulverized fuel nozzle and symmetrically arranged relative to the forward ends of said pulverized fuel and oil spray nozzles, openings in said impeller plate for the passage of pulverized fuel from said pulverized fuel nozzle, and a series of deflecting blades on the forward face of said impeller plate arranged to deflectpulverized fuel passing through said impeller plate openings.

8. A pulverized fuel burner comprising means forming an air chamber having a circular series of air whirling blades adjacent its discharge end, a pulverized fuel discharge nozzle extending into said air chamber and havingits forward end extending within and terminating adjacent to the forward ends of said series of air whirling blades, and a forwardly flaring conically-shaped impeller plate spaced from and symmetrically arranged relative to the forward end of said pulverized fuel nozzle, openings in said impeller plate for the passage of pulverized fuel from said pulverized fuel nozzle, and a series of deflecting blades on the forward face of said impeller plate arranged to deflect pulverized fuel passing through said impeller plate openings.

9. A pulverized fuel burner comprising means forming an air chamber open at its forward end, a pulverized fuel discharge nozzle extending into said air chamber and having its forward end terforming an air chamber open at its forward end,

a pulverized fuel discharge nozzle extending into said air chamber and having its forward end terminating adjacent to the forward end of said air chamber, and a forwardly flaring conicallyshapedimpeller having a circular series of for-' wardly diverging blades spaced from said pulverized fuel nozzle and symmetrically arranged relative to the forward end of said pulverized fuel nozzle, and openings formed in said impeller between said blades for the passage of pulverized fuel therethrough from said pulverized fuel nozzle.

' EDWARD L.' BOLAND. 

